/*清除默认样式*/
* {
	padding: 0;
	margin: 0;
}
ul, ol {
	list-style: none;
}
a {
	text-decoration: none;
	color: #000;
}

/*设置03样式*/
.box {
	width: 100%;
	overflow: hidden;
}
.box p {
	width: 100%;
	height: 100px;
	float: left;
	background-color: green;
}
.box p:nth-child(2) {
	background-color: orange;
}
.box p:last-child {
	background-color: blue;
}